Russia isn’t short of abandoned industrial Soviet structures. Now photographer Armahema has discovered one such facility deep underground below Moscow.

This top secret and almost certainly still classified unit is joined to the Moscow subway system, although the photographer won’t reveal its exact location.

While the entrance and escalator look like any other subway station in the capital, albeit more derelict, once underground, a vast rabbit warren of engine rooms, switchboards, and bunker rooms can be found.